Date: Mon, 16 Sep 2024 17:45:44 -0400 From: Chris Ross <cross+freebsd@distal.com> To: freebsd-net@freebsd.org, Roy Marples <roy@marples.name> Subject: Re: IPv6 neighbor flaps for ISP router are occurring frequently Message-ID: <83BCC913-3375-4847-B720-5F06D76F6646@distal.com> In-Reply-To: <89F4F5A4-E3D9-4A43-84F6-908E3FA221A6@distal.com> References: <89F4F5A4-E3D9-4A43-84F6-908E3FA221A6@distal.com>
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Apologies for lack of important context, the below discusses a FreeBSD 14.1 amd64 system. Thank you. > On Sep 16, 2024, at 16:05, Chris Ross <cross+freebsd@distal.com> wrote: > > Hello. Following the earlier thread "DHCPv6 IA_PD - how-to” I have been > bringing up a new gateway router for my network. With Roy’s help, I > have IPv6 working as expected, but I am seeing something that I suspect > is unusual. Roy doesn’t think it’s specific to dhcpcd, as it is caused > by routing changes that dhcpcd is merely reacting to. > > While dhcpcd is running, it repeatedly logs the following to daemon.log: > > Sep 16 15:55:53 logrus dhcpcd[50070]: vlan0: fe80::3e8a:b0ff:fe3e:4dce is unreachable > Sep 16 15:55:54 logrus dhcpcd[50070]: vlan0: fe80::3e8a:b0ff:fe3e:4dce is reachable again > Sep 16 15:55:54 logrus dhcpcd[50070]: vlan0: soliciting an IPv6 router > Sep 16 15:56:25 logrus dhcpcd[50070]: vlan0: fe80::3e8a:b0ff:fe3e:4dce is unreachable > Sep 16 15:56:25 logrus dhcpcd[50070]: vlan0: fe80::3e8a:b0ff:fe3e:4dce is reachable again > Sep 16 15:56:25 logrus dhcpcd[50070]: vlan0: soliciting an IPv6 router > Sep 16 15:56:57 logrus dhcpcd[50070]: vlan0: fe80::3e8a:b0ff:fe3e:4dce is unreachable > Sep 16 15:56:58 logrus dhcpcd[50070]: vlan0: soliciting an IPv6 router > Sep 16 15:56:58 logrus dhcpcd[50070]: vlan0: Router Advertisement from fe80::3e8a:b0ff:fe3e:4dce > Sep 16 15:57:32 logrus dhcpcd[50070]: vlan0: fe80::3e8a:b0ff:fe3e:4dce is unreachable > Sep 16 15:57:32 logrus dhcpcd[50070]: vlan0: soliciting an IPv6 router > Sep 16 15:57:32 logrus dhcpcd[50070]: vlan0: Router Advertisement from fe80::3e8a:b0ff:fe3e:4dce > > During this same time frame, “route monitor” shows: > > 15:55:53.573 PID 0 delete neigh fe80::3e8a:b0ff:fe3e:4dce%vlan0 state PROBE lladdr 3c:8a:b0:3e:4d:ce iface vlan0 15:55:54.002 PID 0 add/repl neigh fe80::3e8a:b0ff:fe3e:4dce%vlan0 state REACHABLE lladdr 3c:8a:b0:3e:4d:ce iface vlan0 15:56:25.148 PID 0 delete neigh fe80::3e8a:b0ff:fe3e:4dce%vlan0 state PROBE lladdr 3c:8a:b0:3e:4d:ce iface vlan0 15:56:25.212 PID 0 add/repl neigh fe80::3e8a:b0ff:fe3e:4dce%vlan0 state REACHABLE lladdr 3c:8a:b0:3e:4d:ce iface vlan0 15:56:57.406 PID 0 delete neigh fe80::3e8a:b0ff:fe3e:4dce%vlan0 state PROBE lladdr 3c:8a:b0:3e:4d:ce iface vlan0 15:56:58.967 PID 0 add/repl neigh fe80::3e8a:b0ff:fe3e:4dce%vlan0 state REACHABLE lladdr 3c:8a:b0:3e:4d:ce iface vlan0 15:57:32.325 PID 0 delete neigh fe80::3e8a:b0ff:fe3e:4dce%vlan0 state PROBE lladdr 3c:8a:b0:3e:4d:ce iface vlan0 15:57:34.143 PID 0 add/repl neigh fe80::3e8a:b0ff:fe3e:4dce%vlan0 state REACHABLE lladdr 3c:8a:b0:3e:4d:ce iface vlan0 > > My concern is that this is sending RS’s to my provider far too often. > Can anyone advise if this is normal, and assuming not, what might > be wrong? > > Trimmed dhcpcd.conf is: > > duid > persistent > vendorclassid > option classless_static_routes > option rapid_commit > require dhcp_server_identifier > slaac private > noipv6rs > noipv4 > noipv4ll > allowinterfaces vlan0 > interface vlan0 > ipv6only > ipv6rs > ipv6ra_autoconf > ia_pd 0/::/56 intnet1/42 intnet2/56 > > Thanks. > > - Chris >
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